C - Chemistry – Metallurgy – 13 – B
Patent
C - Chemistry, Metallurgy
13
B
C13B 20/16 (2011.01) C13B 30/12 (2011.01)
Patent
CA 2390860
A nanofiltration process for obtaining sucrose uses a feed syrup, such as molasses, that comprises sucrose and no less than about 2 % by weight invert sugars (on a dry solids basis). The nanofiltration produces a permeate and retentate. The nanofiltration permeate will comprise invert sugars that have passed from the feed through the nanofiltration membrane, and preferably will also comprise ash from the feed. The nanofiltration retentate has a higher concentration of sucrose and a lower concentration of invert sugars than the feed syrup. Sucrose can then be crystallized from the nanofiltration retentate. The reduction of the invert content in the syrup facilitates crystallization and thus enhances sucrose recovery.
L'invention concerne un procédé de nanofiltration, permettant d'obtenir du sucrose à partir d'un sirop d'alimentation, tel que des mélasses, qui comprend du sucrose et au moins environ 2 % en poids de sucres invertis (sur la base de solides secs). Le perméat de nanofiltration comprend des sucres invertis qui passent de l'alimentation vers la membrane de nanofiltration, et comprend également, de préférence, des cendres provenant de l'alimentation. Le rétentat de nanofiltration possède une concentration plus élevée en sucrose et une concentration plus faible en sucres invertis que le sirop d'alimentation. Le sucrose peut ensuite être cristallisé à partir du rétentat de nanofiltration. La réduction du contenu inverti dans le sirop facilite la cristallisation et donc la récupération du sucrose.
Donovan Michael
Hlavacek Marc
Osler Hoskin & Harcourt Llp
Tate & Lyle Industries Limited
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